Cutting tool

Abstract

Provided is a cutting tool (500), comprising a housing (1) and a motor assembly (3), a transmission assembly (4), a control assembly (2), a fan (33), and a saw blade (5) which are accommodated in the housing (1). The control assembly (2) controls the motor assembly (3) to operate, and the motor assembly (3) drives the transmission assembly (4) to drive the saw blade (5) to rotate. The housing (1) comprises a first housing (11) for accommodating the transmission assembly (4) and a second housing (12) for accommodating the motor assembly (3). The control assembly (2) is accommodated in the first housing (11). An air outlet (C), a first air inlet (1101) located on the first housing (11), and a second air inlet (1201) located on the second housing (12) are formed on the housing (1). The motor assembly (3) drives the fan (33) to rotate to form a first airflow channel (F1) through which an airflow flows from the first air inlet (1101) to the air outlet (C) and a second airflow channel (F2) through which an airflow flows from the second air inlet (1201) to the air outlet (C). The control assembly (2) is at least partially exposed in the first airflow channel (F1), and the motor assembly (3) is at least partially exposed in the second airflow channel (F2). By means of such arrangement, effective cooling for the control assembly (2), the motor assembly (3), and the transmission assembly (4) is achieved while the internal structure of the cutting tool (500) is made compact.

Description

cutting tools Technical Field

[0001] The present invention relates to the technical field of electric tools, and in particular to a cutting tool with a compact structure and good heat dissipation effect. Background Art

[0002] Many existing cutting tools, such as electric circular saws, marble cutters, and sawing machines, typically include a housing, a motor assembly housed within the housing, a transmission assembly connected to the motor assembly, a control assembly electrically connected to the motor assembly, and a saw blade driven by the transmission assembly. The control assembly, motor assembly, and transmission assembly generate a significant amount of heat during operation. Excessive temperatures can affect the proper functioning of the cutting tool. To dissipate heat from the control and motor assemblies, a fan driven by the motor assembly is located within the housing.

[0003] In order to solve the heat dissipation problem of cutting tools, please refer to Chinese utility model patent CN212704724U published on March 16, 2021. This patent discloses a cutting tool, the housing of which includes a motor housing for accommodating a motor assembly, a handle housing connected to the motor housing, and a gear box housing for accommodating a transmission assembly. The control assembly is accommodated in the handle housing, and a fan driven to rotate by the motor assembly is provided in the motor housing. The rotation of the fan generates an airflow to cool the control assembly and the motor assembly. However, on the one hand, since the controller is accommodated in the handle housing, the size of the handle housing is large, which affects the user's gripping experience; on the other hand, the cooling air is blown towards the gear box after cooling the control assembly and / or the motor assembly. Since the air blown towards the gear box is hot air, and the transmission assembly accommodated in the gear box also generates heat, the heat from the two aspects is superimposed on each other in the gear box, resulting in the heat of the transmission assembly not being effectively dissipated by the airflow generated by the fan. The temperature of the transmission assembly rises significantly. When the cutting tool is running for a long time, the transmission assembly is at risk of being damaged by high temperature, which affects the user's safety.

[0004] In view of this, it is indeed necessary to provide an improved cutting tool to overcome the defects of the prior art. Summary of the Invention

[0005] In view of the deficiencies of the prior art, an object of the present invention is to provide a cutting tool with a compact structure and good heat dissipation effect.

[0006] The technical solution adopted by the present invention to solve the problems of the prior art is:

[0007] A cutting tool comprises a shell, a motor assembly housed in the shell, a transmission assembly connected to the motor assembly, a control assembly electrically connected to the motor assembly, a fan driven to rotate by the motor assembly, and a saw blade driven by the transmission assembly, wherein the control assembly controls the operation of the motor assembly, and the motor assembly drives the transmission assembly to drive the saw blade to rotate; the shell comprises a first shell for accommodating the transmission assembly and a second shell for accommodating the motor assembly; the control assembly is accommodated in the first shell, and the shell is provided with a first air inlet located on the first shell, a second air inlet located on the second shell, and an air outlet located on the first shell and / or the second shell, the motor assembly drives the fan to rotate to form a first air flow channel for air to flow from the first air inlet to the air outlet and a second air flow channel for air to flow from the second air inlet to the air outlet, the control assembly is at least partially exposed in the first air flow channel, and the motor assembly is at least partially exposed in the second air flow channel.

[0008] A further improved solution is: the fan includes a circular disk body, a first blade group extending from the disk body toward the control component, and a second blade group extending from the disk body back to the control component, the first blade group is located in the first air flow channel, and the second blade group is located in the second air flow channel.

[0009] A further improved solution is: the number of blades in the first blade group is less than or equal to the number of blades in the second blade group.

[0010] A further improvement is as follows: the first shell includes a guard covering the outer periphery of the saw blade and an intermediate cover attached to the guard, the intermediate cover is provided with a first accommodation space for accommodating the control component and a second accommodation space for accommodating the transmission component, the first air inlet connects the inside and outside of the first accommodation space, the first accommodation space is connected to the second accommodation space, and the airflow in the first air flow channel flows from the first air inlet through the first accommodation space and the second accommodation space in sequence and then flows out from the air outlet.

[0011] A further improvement is as follows: the control component includes a circuit board electrically connected to the motor component and a circuit board housing for accommodating the circuit board, the circuit board housing being provided with a plurality of heat dissipation protrusions on the outer wall, and the plurality of heat dissipation protrusions extending into the first air flow channel.

[0012] A further improved solution is: the heat dissipation protrusions extend toward the inner wall of the first shell, and the airflow in the first airflow channel passes through the gaps between the plurality of heat dissipation protrusions.

[0013] A further improved solution is: the first shell is made of metal material, the control component includes a bracket arranged on the outer periphery of the circuit board shell, the bracket is made of insulating material, and the circuit board shell is supported in the first shell by the bracket.

[0014] A further improved solution is: the control component further includes a pressure plate fixedly connected to the first shell, and the pressure plate abuts against the control component to clamp the control component in the bracket.

[0015] A further improved solution is: the second shell includes a motor housing that accommodates the motor assembly and a main handle connected to the motor housing, the main handle extends parallel to the saw blade, the first air inlet is arranged between the saw blade and the main handle, and the second air inlet is arranged at the end of the motor housing away from the saw blade.

[0016] A further improvement is as follows: the motor assembly includes a motor shaft perpendicular to the saw blade, the fan is fixed on the side of the motor shaft close to the saw blade, the second shell includes an air guide ring covering the outer periphery of the fan, the air guide ring is provided with a first opening and a second opening located on the circumferential wall, the air outlet is located on the motor shell and includes a first air outlet arranged corresponding to the first opening and a second air outlet arranged corresponding to the second opening.

[0017] A further improvement is that the extended end of the main handle is provided with a battery pack mounting portion for slidingly inserting a battery pack, and the extending direction of the battery pack mounting portion is not perpendicular to the extending direction of the main handle.

[0018] A further improved solution is: the main handle includes a first half shell and a second half shell that can be buckled together, the first half shell is fixedly connected to the first shell by screws, and the area of ​​the second half shell is larger than that of the first half shell.

[0019] A further improved solution is that the second half shell and the motor shell are integrally injection molded.

[0020] A further improvement is as follows: the motor assembly is a brushless motor, and the diameter of the saw blade is not greater than 160 mm.

[0021] The present invention can also adopt the following technical solutions to solve the problems of the prior art:

[0022] A cutting tool, comprising a housing, a motor assembly housed in the housing, a transmission assembly connected to the motor assembly, a control assembly electrically connected to the motor assembly, a fan driven to rotate by the motor assembly, and a saw blade driven to rotate by the transmission assembly; the housing comprises a main handle extending in a front-to-rear direction, an intermediate cover connected to the main handle, a static shield provided on one lateral side of the intermediate cover, and a motor housing provided on the other lateral side of the intermediate cover; the motor assembly is housed in the motor housing, the transmission assembly is housed in the intermediate cover, and the saw blade is housed in the static shield; the motor assembly drives the transmission assembly and causes the saw blade to rotate;

[0023] The control assembly is arranged in the middle cover; the middle cover is provided with a first air inlet, and the first air inlet is arranged between the control assembly and the saw blade; the motor housing is provided with a second air inlet; and the housing is also provided with an air outlet;

[0024] The motor assembly drives the fan to rotate to form a first air flow channel flowing from the first air inlet to the air outlet and a second air flow channel flowing from the second air inlet to the air outlet;

[0025] The control assembly is located in the first air flow channel, and the motor assembly is located in the second air flow channel.

[0026] A further improvement is as follows: the cutting tool also includes a base plate disposed below the shell, the shell is pivotally connected to the base plate, and the base plate is provided with a saw blade through-hole for the saw blade to pass through; the air outlet is disposed in front of the motor housing to allow the airflow generated by the fan to blow from the air outlet to the front of the base plate; the first airflow channel and the second airflow channel merge at the air outlet.

[0027] A further improved solution is: the fan is a centrifugal fan arranged between the control component and the motor component, and the projections of the control component and the fan on the axis of the motor component do not overlap.

[0028] The present invention can also adopt the following technical solutions to solve the problems of the prior art:

[0029] A cutting tool, comprising a housing, a motor assembly housed within the housing, a transmission assembly connected to the motor assembly, a control assembly electrically connected to the motor assembly, a fan driven to rotate by the motor assembly, and a saw blade driven to rotate by the transmission assembly; the housing comprises a motor case for accommodating the motor assembly, an intermediate cover for accommodating the transmission assembly, and a static shield for accommodating the saw blade, the intermediate cover being located between the motor case and the static shield; the motor assembly drives the transmission assembly and drives the saw blade to rotate;

[0030] The control assembly is arranged in the middle cover, the middle cover is provided with a first air inlet; the motor housing is provided with a second air inlet; and the housing is also provided with an air outlet;

[0031] The motor assembly drives the fan to rotate to form a first air flow channel flowing from the first air inlet to the air outlet and a second air flow channel flowing from the second air inlet to the air outlet;

[0032] The first air flow channel is configured such that: air flows from the first air inlet into the middle cover, sequentially flows through the control assembly, the transmission assembly, and the motor assembly, and flows out of the housing through the air outlet; or, air flows from the first air inlet into the middle cover, sequentially flows through the control assembly and the transmission assembly, and flows out of the housing through the air outlet.

[0033] The second air flow channel is configured such that air flows from the second air inlet into the motor housing, flows through the motor assembly, and flows out of the housing from the air outlet.

[0034] A further improvement is as follows: the fan is arranged between the control component and the motor component, the second air inlet is arranged at the axial end of the motor housing away from the saw blade, a partition is provided in the motor housing, and the partition is constructed to allow the airflow in the first airflow channel to flow through the motor component from the axial end of the motor component away from the saw blade.

[0035] A further improvement is that the fan is arranged at the axial end of the motor housing away from the saw blade, the second air inlet is arranged at the axial end of the motor housing close to the saw blade, and the air outlet is arranged at the axial end of the motor housing away from the saw blade.

[0036] Compared with the prior art, the present invention has the following beneficial effects: by arranging the control assembly in the first housing that accommodates the transmission assembly and providing a corresponding air path, the internal structure of the cutting tool is made compact while also achieving effective cooling of the control assembly, motor assembly, and transmission assembly. Specifically, the control assembly and transmission assembly are both housed in an intermediate cover, a first air inlet is provided on the intermediate cover, a second air inlet is provided on the motor housing, and an air outlet is provided on the first housing and / or the second housing; the motor assembly drives the fan to rotate to form a first air flow channel for air to flow from the first air inlet to the air outlet and a second air flow channel for air to flow from the second air inlet to the air outlet, the control assembly is at least partially exposed in the first air flow channel, and the motor assembly is at least partially exposed in the second air flow channel. Furthermore, in order to achieve a better heat dissipation effect, the fan is preferably a double-sided centrifugal fan, that is, the fan includes a circular disk, a first blade group extending from the disk toward the control assembly, and a second blade group extending from the disk away from the control assembly, the first blade group rotating to form the first air flow channel, and the second blade group rotating to form the second air flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings:

[0038] FIG1 is a schematic diagram of the overall structure of a cutting tool according to a preferred embodiment of the present invention;

[0039] FIG2 is a right side view of the cutting tool shown in FIG1;

[0040] FIG3 is a perspective view of the cutting tool shown in FIG1 in a state of minimum cutting depth;

[0041] FIG4 is a rear view of the cutting tool shown in FIG1 ;

[0042] FIG5 is a top view of the cutting tool shown in FIG1 , with the main parts shown in cross section;

[0043] FIG6 is an exploded schematic diagram of the cutting tool shown in FIG1 ;

[0044] FIG7 is a partially exploded schematic diagram of the cutting tool shown in FIG1 ;

[0045] 8A and 8B are schematic structural diagrams of the middle cover shown in FIG6 ;

[0046] FIG9 is a perspective view of a first housing of the cutting tool shown in FIG1 ;

[0047] FIG10 is a perspective cross-sectional view of the first housing of the cutting tool shown in FIG1 when the control assembly is installed;

[0048] FIG11 is a perspective view of the intermediate cover of the cutting tool shown in FIG1 when the control assembly and the motor assembly are installed;

[0049] FIG12 is an exploded schematic diagram of the motor assembly of the cutting tool shown in FIG1 ;

[0050] FIG13 is an exploded schematic diagram of the saw blade, the first housing, and the transmission assembly of the cutting tool shown in FIG1 ;

[0051] FIG14 is a schematic diagram of the air duct of the cutting tool shown in FIG1 ;

[0052] FIG15 is a schematic diagram of another embodiment of the air duct of the cutting tool of the present invention;

[0053] FIG. 16 is a schematic diagram of another embodiment of the air duct of the cutting tool of the present invention.

[0054] Meanings of the reference numerals in the figures: Housing 1; first housing 11; middle cover 110; first air inlet 1101; light-emitting element mounting portion 112; second housing 12; motor housing 120; second air inlet 1201; main handle 121; first half housing 121a; second half housing 121b; battery pack mounting portion 122; auxiliary handle 13; trigger 14; switch 15; first air outlet 16; second air outlet 17; control assembly 2; circuit board 20; circuit board housing 21; heat dissipation protrusion 211; bracket 22; through hole 220; pressure plate 23; motor assembly 3; rotor 30; rotor shaft 301; stator 31; air guide ring 32; first opening 321; second opening-322; fan-33; disk-330; first blade group-331; second blade group-332; transmission assembly-4; locking nut-40; outer pressure plate-41; inner pressure plate-42; output shaft-43; bearing chamber-44; reduction gear-45; saw blade-5; shield-50; cutting tool-500; ventilation hole-501; static shield-51; dynamic shield-52; bottom plate-6; air outlet-C; first air flow channel-F1; second air flow channel-F2; partition-L; first accommodating space-S1; second accommodating space-S2. DETAILED DESCRIPTION

[0055] The terms used in this disclosure are for the sole purpose of describing specific embodiments and are not intended to limit the disclosure. For example, terms such as "upper," "lower," "front," and "backward" that indicate orientation or positional relationships are based solely on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the disclosure. They do not indicate or imply that the device or element referred to must have a specific orientation or be constructed or operated in a specific orientation, and therefore should not be construed as limiting the disclosure. For ease of description, the view shown in FIG. 1 is used as the basis for describing the terms "upper," "lower," "left," "right," "front," and "backward."

[0056] Referring to Figures 1 to 6 , a cutting tool 500 according to the present invention is shown. The cutting tool 500 includes a housing 1 and a base plate 6 pivotally connected to the housing 1. Housing 1 houses a motor assembly 3, a transmission assembly 4 connected to the motor assembly 3, a control assembly 2 electrically connected to the motor assembly 3, a fan 33 driven for rotation by the motor assembly 3, and a saw blade 5 driven by the transmission assembly 4. The control assembly 2 is electrically connected to the motor assembly 3 and is used to control the operation of the motor assembly 3. The motor assembly 3 drives the transmission assembly 4 to rotate the saw blade 5.

[0057] As shown in Figure 12 , the motor assembly 3 includes a rotor 30 that rotates when energized, and a stator 31 disposed on the outer periphery of the rotor 30. The rotor 30 includes a rotor shaft 301 perpendicular to the saw blade 5 and a fan 33 secured to the rotor shaft 301. In this embodiment, the motor assembly 3 is an inner rotor brushless motor; in another embodiment, the motor assembly 3 is a brushed motor; in another embodiment, the motor assembly 3 is an outer rotor motor. In another embodiment, the fan 33 is mounted on the transmission assembly 4 and is driven by the motor assembly 3.

[0058] Referring to Figure 13 , the transmission assembly 4 includes a reduction gear 45 meshing with the rotor shaft 301, an output shaft 43 for securing the reduction gear 45, a bearing (not shown) mounted on the output shaft 43, a bearing chamber 44 for supporting the bearing, an inner pressure plate 42 abutting the inner side of the saw blade 5, an outer pressure plate 41 abutting the outer side of the saw blade 5, and a locking nut 40 for securing the inner and outer pressure plates 42 and 41. The bearing chamber 44 is fixedly connected to the intermediate cover 110 via screws (not shown), and the outer circumferential surface of the bearing chamber 44 supports the dynamic shield 52. In this embodiment, the transmission assembly 4 is a single-stage reduction gear; in other embodiments of the present invention, the transmission assembly 4 is a multi-stage reduction gear, such as a two-stage reduction gear or a three-stage reduction gear.

[0059] 1 to 6 , the housing 1 of the cutting tool 500 is divided into two parts: a first housing 11 and a second housing 12 .

[0060] Specifically, the first housing 11 includes a shield 50 disposed around the outer periphery of the saw blade 5 and an intermediate cover 110 fixedly connected to the shield 50. A transmission assembly 4, such as a reduction gear 45, is provided in the shield 50 and the intermediate cover 110. The shield 50 includes a static shield 51 and a dynamic shield 52 rotatably connected to the static shield 51. A removable auxiliary handle 13 is also fixed to the right side of the static shield 51. Preferably, the static shield 51 and the intermediate cover 110 are made of a metal material with high hardness and good thermal conductivity, and the dynamic shield 52 is made of a relatively wear-resistant plastic material. In another embodiment of the present invention, the static shield 51 and the intermediate cover 110 are made integrally. Preferably, the diameter of the saw blade 5 is not greater than 160 mm, and the diameter of the saw blade 5 can be 155 mm. A saw blade 5 of this size is suitable for an electric circular saw called a "single-hand saw."

[0061] The second housing 12 includes a motor housing 120 that accommodates the motor assembly 3 and a main handle 121 connected to the motor housing 120. The static shield 51, the intermediate cover 110, and the motor housing 120 are arranged in sequence from left to right. The main handle 121 is provided with a grip portion for the user to hold. The main handle 121 is divided into a first half shell 121a located on the left and a second half shell 121b located on the right. The first half shell 121a and the second half shell 121b are connected to each other by screws and buckles. The main handle 121 is provided with a trigger 14 and a switch 15 inside. The user holds the main handle 121 and presses the trigger 14 to trigger the switch 15, and then the cutting tool 500 is powered on and starts working. Preferably, during assembly, the first half-shell 121a is first fixedly engaged with the intermediate cover 110 and then fixedly connected to the second half-shell 121b. The triggers 14 and 15 are disposed within the first half-shell 121a. To repair or replace the switch 15, the user need only remove the second half-shell 121b from the right side of the cutting tool 500, making maintenance more convenient. In another embodiment of the present invention, the second half-shell 121b and the motor housing 120 are integrally molded by injection molding.

[0062] In this embodiment, the main handle 121 extends backward from the rear end of the motor housing 120 in a direction parallel to the saw blade 5, and a battery pack mounting portion 122 for slidingly engaging a battery pack (not shown) is provided at the extended end of the main handle 121. As shown in Figure 2, the extension direction of the battery pack mounting portion 122 is not perpendicular to the extension direction of the main handle 121; specifically, the upper end of the battery pack mounting portion 122 is further away from the main handle 121 than its lower end; with this arrangement, when the user holds the main handle 121 with one hand to perform cutting operations at various angles, the battery pack will not hinder the normal grip of the hand. In another embodiment of the present invention, the main handle 121 is an annular handle, that is, the motor housing 120 and the battery pack mounting portion 122 have two connecting parts (not shown). In another embodiment of the present invention, the cutting tool 500 is powered by an AC power cord (not shown).

[0063] In order to achieve heat dissipation of the cutting tool 500 , the control assembly 2 is housed in the first housing 11 . Specifically, the control assembly 2 is housed in the middle cover 110 of the first housing 11 .

[0064] 8A and 8B , the intermediate cover 110 is provided with a first accommodation space S1 for accommodating the control assembly 2 and a second accommodation space S2 for accommodating the transmission assembly 4. The first accommodation space S1 is located behind the second accommodation space S2, and both the first accommodation space S1 and the second accommodation space S2 are located on a side of the intermediate cover 110 away from the saw blade 5.

[0065] To help the operator see the area in front of the cutting tool 500 more clearly, a light-emitting element mounting portion 112 is provided on the front sidewall of the intermediate cover 110. This portion is used to mount a light-emitting element, such as an LED lamp (not shown). When a light-emitting element is mounted in the portion 112, its heat can be dissipated through the intermediate cover 110, effectively extending its service life.

[0066] Please refer to Figures 7, 9 and 10. The control component 2 includes a circuit board 20 electrically connected to the motor component 3 and a circuit board housing 21 that accommodates the circuit board 20. Usually, an insulating glue (not shown) is provided between the circuit board 20 and the circuit board housing 21; in order to increase the heat dissipation area, a number of heat dissipation protrusions 211 are provided on the outer wall of the circuit board housing 21. Preferably, the circuit board housing 21 is made of aluminum or aluminum alloy with good thermal conductivity. For ease of understanding, the circuit board 20 and the dynamic shield 52 are hidden in Figure 7, and the circuit board 20 and the circuit board housing 21 are hidden in Figure 9.

[0067] Optionally, the control assembly 2 further includes a bracket 22 disposed on the periphery of the circuit board housing 21. The bracket 22 is secured within the intermediate cover 110 and is made of an insulating material. The bracket 22 serves to isolate the circuit board housing 21 from the intermediate cover 110, thereby preventing the intermediate cover 110 from scratching components on the circuit board 20 and external static electricity from being conducted through the intermediate cover 110 and circuit board housing 21 to the circuit board 20, effectively preventing damage to the circuit board 20.

[0068] Optionally, to more securely secure the control assembly 2 within the intermediate cover 110, the control assembly 2 further includes a pressure plate 23 fixedly connected to the first housing 11. The pressure plate 23 abuts against the control assembly 2 to clamp the control assembly 2 within the bracket 22. Preferably, the pressure plate 23 is an arc-shaped plate, and one end of the pressure plate 23 is fixedly connected to the intermediate cover 110 by a screw (not shown), while the other end of the pressure plate 23 presses the circuit board 20 or the circuit board housing 21.

[0069] The heat dissipation air path of the cutting tool 500 will be described in detail below.

[0070] 3, 4 and 5, the housing 1 is provided with a first air inlet 1101 on the intermediate cover 110, a second air inlet 1201 on the motor housing 120, and a first air outlet 16 and a second air outlet 17 on the motor housing 120. For ease of understanding, the saw blade 5 and part of the transmission assembly 4 are hidden in FIG5.

[0071] In this embodiment, the intermediate cover 110 is a semi-enclosed structure, with a first air inlet 1101 located on the end surface of the intermediate cover 110 facing the saw blade 5. The first air inlet 1101 is positioned between the saw blade 5 and the main handle 121. The bracket 22 is provided with a through hole 220 for ventilation, and the through hole 220 corresponds to the first air inlet 1101. In another embodiment of the present invention, the intermediate cover 110 is a fully enclosed structure that completely surrounds the control assembly 2. In another embodiment of the present invention, the first air inlet 1101 is located on one or more side walls of the intermediate cover 110.

[0072] The first air outlet 16 is located in front of the motor housing 120, facing the base plate 6, and is used to blow away chips and dust that have fallen on the front end of the base plate 6. The second air outlet 17 is located below the motor housing 120, facing the base plate 6, and is used to blow away chips and dust that have fallen near the saw blade 5. In another embodiment of the present invention, only one of the first air outlet 16 and the second air outlet 17 may be provided. In another embodiment of the present invention, the first air outlet 16 and / or the second air outlet 17 are located on the intermediate cover 110 or the static shield 51.

[0073] The motor assembly 3 drives the fan 33 to rotate to form a first air flow channel F1 in which air flows from the first air inlet 1101 to the first air outlet 16 and the second air outlet 17, and a second air flow channel F2 in which air flows from the second air inlet 1201 to the first air outlet 16 and the second air outlet 17. The control assembly 2 is at least partially exposed in the first air flow channel F1, and the motor assembly 3 is at least partially exposed in the second air flow channel F2.

[0074] As shown in Figure 11 , the fan 33 is a double-sided centrifugal fan. The fan 33 includes a circular disk 330, a first blade assembly 331 extending from the disk 330 toward the control assembly 2, and a second blade assembly 332 extending from the disk 330 away from the control assembly 2. The first blade assembly 331 is located within the first airflow channel F1, and the second blade assembly 332 is located within the second airflow channel F2. The first blade assembly 331 rotates to create a negative pressure, drawing air in through the first air inlet 1101. The second blade assembly 332 rotates to create a negative pressure, drawing air in through the second air inlet 1201. Preferably, the number of blades in the first blade assembly 331 is equal to or less than the number of blades in the second blade assembly 332.

[0075] As shown in Figure 12, optionally, in order to further enhance the air suction effect, an air guide ring 32 is provided on the outer periphery of the fan 33. The air guide ring 32 is provided with a first opening 321 and a second opening 322 located on the circumferential wall. The first opening 321 is provided corresponding to the first air outlet 16, and the second opening 322 is provided corresponding to the second air outlet 17. The air guide ring 32 is fixed in the motor housing 120 and is located between the fan 33 and the stator 31. In this embodiment, the area of ​​the first opening 321 is smaller than the area of ​​the second opening 322; in other embodiments of the present invention, the area of ​​the first opening 321 is greater than or equal to the area of ​​the second opening 322.

[0076] As shown in FIG10 , a rib (not shown) protrudes from the right side of the static shield 51 for engaging the intermediate cover 110, and a plurality of ventilation holes 501 are provided on the rib near the first air inlet 1101. In this embodiment, the ventilation holes 501 are located between the static shield 51 and the main handle 121.

[0077] Preferably, the heat dissipation protrusions 211 of the circuit board housing 21 extend into the first air flow channel F1; further, the heat dissipation protrusions 211 extend toward the inner wall of the first shell 11, and the air flow in the first air flow channel F1 passes through the gaps between the heat dissipation protrusions 211.

[0078] Preferably, the first air inlet 1101 connects the interior and exterior of the first storage space S1, and the first storage space S1 connects to the second storage space S2, so that the airflow in the first airflow channel F1 flows from the first air inlet 1101 through the first storage space S1 and the second storage space S2 in sequence. Specifically, when the fan 33 rotates, the airflow in the first airflow channel F1 is preferably configured as follows: the fan 33 rotates to create a negative pressure, sucking in external air through the ventilation holes 501, which then flows through a small portion of the surface of the static shield 51, and then flows into the first storage space S1 from the first air inlet 1101 and the through hole 220, then flows through the heat dissipation protrusion 211 of the circuit board housing 21, and then flows from the gap between the pressure plate 23 and the middle cover 110 to the second storage space S2, and finally flows out from the first air outlet 16 and / or the second air outlet 17. With such a configuration, the air path has good sealing and directionality, so that the airflow can flow through the control component 2 along a longer path without air leakage; at the same time, the air path has a good heat dissipation effect. When the airflow flows in the first accommodating space S1, one side contacts the middle cover 110 and the other side contacts the heat dissipation protrusion 211, which not only enables the control component 2 to cool down quickly, but also ensures that the temperature of the airflow flowing to the second accommodating space S2 is not too high, and the transmission component 4 can be effectively cooled.

[0079] In another embodiment of the present invention, a filtering structure such as a filter screen can be set on the path between the ventilation hole 501 and the first air inlet 1101 of the first air flow channel F1, which can effectively prevent chips and dust from entering the first accommodation space S1 from the first air inlet 1101, thereby protecting the cutting tool 500 from the influence of chips and dust.

[0080] FIG14 is a schematic diagram of the air duct of the cutting tool 500 of the present invention. The guard 50, intermediate cover 110, and motor housing 120 are arranged sequentially from left to right. The guard 50 houses the saw blade 5, the intermediate cover 110 houses the control assembly 2 and transmission assembly 4, and the motor housing 120 houses the stator 31, the rotor 30 that rotates relative to the stator 31, and the fan 33 driven by the rotor 30. The guard 50 and intermediate cover 110 form the first housing 11, while the motor housing 120 and handle housing (not shown) form the second housing 12. A first air inlet 1101 is located on the intermediate cover 110, positioned horizontally between the saw blade 5 and the control assembly 2. A second air inlet 1201 is located at the right end of the motor housing 120, away from the saw blade 5. An air outlet C is located on the front sidewall of the motor housing 120. The fan 33 is located on the side of the motor housing 120 near the saw blade 5, between the stator 31 and the control assembly 2. The fan 33 is preferably a double-sided centrifugal fan. The blades on the side of the fan 33 facing the control assembly 2 form a first airflow channel F1, while the blades on the side of the fan 33 facing away from the control assembly 2 form a second airflow channel F2. When the fan 33 rotates, the first airflow channel F1 is configured to draw air in through the first air inlet 1101, which then flows through the control assembly 2 and the transmission assembly 4, and finally flows out through the air outlet C. The second airflow channel F2 is configured to draw air in through the second air inlet 1201, which then flows through the rotor 30 and stator 31, and finally flows out through the air outlet C. The first airflow channel F1 and the second airflow channel F2 merge at the front end of the fan 33.

[0081] Please refer to Figure 15, which is a schematic diagram of another embodiment of the air duct of a cutting tool 500 according to the present invention. The guard 50, intermediate cover 110, and motor housing 120 are arranged in sequence from left to right. The guard 50 houses the saw blade 5, the intermediate cover 110 houses the control assembly 2 and transmission assembly 4, and the motor housing 120 houses the stator 31, the rotor 30 that rotates relative to the stator 31, and the fan 33 driven by the rotor 30. The guard 50 and intermediate cover 110 form the first housing 11, while the motor housing 120 and handle housing (not shown) form the second housing 12. A first air inlet 1101 is located on the intermediate cover 110, positioned horizontally between the saw blade 5 and the control assembly 2. A second air inlet 1201 is located at the right end of the motor housing 120, away from the saw blade 5. An air outlet C is located on the front sidewall of the motor housing 120. The fan 33 is located on the side of the motor housing 120 near the saw blade 5. The fan 33 is an axial-flow or centrifugal fan, with a partition L disposed in the motor housing 120. When the fan 33 rotates, the first airflow channel F1 is configured to draw air in through the first air inlet 1101. The air then flows sequentially through the control assembly 2 and the transmission assembly 4, guided by the partition L, through the rotor 30 and stator 31 from the right end, and finally out through the air outlet C. The second airflow channel F2 is configured to draw air in through the second air inlet 1201, then through the rotor 30 and stator 31, and finally out through the air outlet C. The first and second airflow channels F1 and F2 merge at the right end of the rotor 30 and stator 31.

[0082] Please refer to Figure 16, which is a schematic diagram of another embodiment of the air duct of a cutting tool 500 according to the present invention. The guard 50, intermediate cover 110, and motor housing 120 are arranged in sequence from left to right. The guard 50 houses the saw blade 5, the intermediate cover 110 houses the control assembly 2 and transmission assembly 4, and the motor housing 120 houses the stator 31, the rotor 30 that rotates relative to the stator 31, and the fan 33 driven by the rotor 30. The guard 50 and intermediate cover 110 form the first housing 11, while the motor housing 120 and handle housing (not shown) form the second housing 12. A first air inlet 1101 is located on the intermediate cover 110, positioned horizontally between the saw blade 5 and the control assembly 2. A second air inlet 1201 is located on the front sidewall of the motor housing 120. An air outlet C is located at the right end of the motor housing 120, facing away from the saw blade 5. The fan 33 is located on the side of the motor housing 120 facing away from the saw blade 5. The fan 33 is preferably an axial flow fan. Rotation of the fan 33 forms a first airflow channel F1 and a second airflow channel F2. When the fan 33 rotates, the first airflow channel F1 is configured to draw air in through the first air inlet 1101. The air then flows sequentially through the control assembly 2 and the transmission assembly 4, then through the rotor 30 and stator 31, and finally out through the air outlet C. The second airflow channel F2 is configured to draw air in through the second air inlet 1201. The air then flows through the rotor 30 and stator 31, and finally out through the air outlet C. The first and second airflow channels F1 and F2 merge at the left end of the rotor 30 and stator 31.

[0083] In this embodiment, when the user holds the main handle 121 with his hand, the saw blade 5 is placed on the left side of the main handle 121; it can be understood that the above heat dissipation solution is also applicable to the situation where the saw blade 5 is placed on the right side of the main handle 121.

[0084] In the present invention, by disposing the control assembly 2 in the first housing 11 that houses the transmission assembly 4 and providing corresponding air passages, the internal structure of the cutting tool 500 is made compact while also achieving effective cooling of the control assembly 2, the motor assembly 3, and the transmission assembly 4. Specifically, the control assembly 2 and the transmission assembly 4 are both housed in the intermediate cover 110, which has a first air inlet 1101 formed therein, a second air inlet 1201 formed therein, and an air outlet provided on the first housing 11 and / or the second housing 12. The motor assembly 3 drives the fan 33 to rotate to form a first airflow channel F1, through which air flows from the first air inlet 1101 to the air outlet, and a second airflow channel F2, through which air flows from the second air inlet 1201 to the air outlet. The control assembly 2 is at least partially exposed within the first airflow channel F1, and the motor assembly 3 is at least partially exposed within the second airflow channel F2. Furthermore, in order to obtain a better heat dissipation effect, the fan 33 is preferably a double-sided centrifugal fan, that is, the fan 33 includes a circular disk body 330, a first blade group 331 extending from the disk body 330 toward the control component 2, and a second blade group 332 extending from the disk body 330 back to the control component 2. The first blade group 331 rotates to form a first air flow channel F1, and the second blade group 332 rotates to form a second air flow channel F2.

[0085] The present invention is not limited to the above-described specific embodiments. Those skilled in the art will readily appreciate that many alternatives to the cutting tool of the present invention exist without departing from the principles and scope of the present invention. The scope of protection of the present invention shall be determined by the claims.

Claims

1. A cutting tool, comprising a housing, a motor assembly received in the housing, a transmission assembly connected to the motor assembly, a control assembly electrically connected to the motor assembly, a fan driven to rotate by the motor assembly, and a saw blade driven by the transmission assembly, wherein the control assembly controls the operation of the motor assembly, and the motor assembly drives the transmission assembly to drive the saw blade to rotate; the housing includes a first housing for receiving the transmission assembly and a second housing for receiving the motor assembly; characterized in that: The control component is received in the first housing. The housing is provided with a first air inlet on the first housing, a second air inlet on the second housing, and an air outlet on the first housing and / or the second housing. The motor component drives the fan to rotate to form a first air flow channel in which air flows from the first air inlet to the air outlet and a second air flow channel in which air flows from the second air inlet to the air outlet. At least part of the control component is exposed in the first air flow channel, and at least part of the motor component is exposed in the second air flow channel.

2. The cutting tool according to claim 1, wherein: The fan is disposed between the control component and the motor component. The fan includes a circular disk body, a first blade group extending from the disk body toward the control component, and a second blade group extending from the disk body away from the control component. The first blade group is located in the first air flow channel, and the second blade group is located in the second air flow channel.

3. The cutting tool according to claim 2, characterized in that: The number of blades of the first blade group is less than or equal to the number of blades of the second blade group.

4. The cutting tool according to claim 1 or 2, characterized in that: The first housing includes a guard covering the outer periphery of the saw blade and an intermediate cover attached to the guard. The intermediate cover is provided with a first accommodation space for receiving the control component and a second accommodation space for receiving the transmission component. The first air inlet communicates the interior and the exterior of the first accommodation space. The first accommodation space communicates with the second accommodation space. The air in the first air flow channel flows out from the air outlet after flowing through the first accommodation space and the second accommodation space in sequence from the first air inlet.

5. The cutting tool according to claim 1 or 2, characterized in that: The control component includes a circuit board electrically connected to the motor component and a circuit board housing for receiving the circuit board. The circuit board housing is provided with a plurality of heat dissipation protrusions on the outer wall, and the plurality of heat dissipation protrusions extend into the first air flow channel.

6. The cutting tool according to claim 5, characterized in that: The heat dissipation protrusions extend toward the inner wall of the first housing, and the air in the first air flow channel passes through the gaps between the plurality of heat dissipation protrusions.

7. The cutting tool according to claim 5, wherein: The first housing is made of a metal material. The control component includes a bracket disposed on the outer periphery of the circuit board housing. The bracket is made of an insulating material, and the circuit board housing is supported in the first housing by the bracket.

8. The cutting tool according to claim 7, characterized in that: The control component further includes a pressing plate fixedly connected to the first housing. The pressing plate abuts against the control component to clamp the control component in the bracket.

9. The cutting tool according to claim 1, wherein: The second housing includes a motor housing for receiving the motor component and a main handle connected to the motor housing. The main handle extends parallel to the saw blade. The first air inlet is provided between the saw blade and the main handle, and the second air inlet is provided at an end of the motor housing away from the saw blade.

10. The cutting tool according to claim 9, characterized in that: The motor component includes a motor shaft perpendicular to the saw blade. The fan is fixed on a side of the motor shaft close to the saw blade. The second housing includes a wind guiding ring covering the outer periphery of the fan. The wind guiding ring is provided with a first opening and a second opening on the circumferential wall. The air outlet is located on the motor housing and includes a first air outlet corresponding to the first opening and a second air outlet corresponding to the second opening.

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